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Analytical determination of the constitutive behavior from micro-pillar testing: Application to a tempered martensitic steel

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Nanocrystalline metals have been an area of great interest in recent years due to their enhanced characteristics. One of the most striking is implied by the Hall-Petch relation: with decreasing grain size the material becomes stronger. This promise is fulf ...

EPFL2006

Nuclear materials have been successfully employed in commercial fission reactors for many decades. Research and material development for advanced fission system and future thermo-nuclear fusion reactors have acquired maturity while great challenges remain ...

EPFL2005

Assessment of irradiation-hardening on Eurofer97' and Zircaloy 2 with punch tests and finite-element modeling

Philippe Spätig, Emiliano Campitelli

We present an assessment of the mechanical constitutive behavior after irradiation for a tempered martensitic steel, Eurofer97', and for Zircaloy by means of small-ball punch tests. For that purpose we use a finite-element model of the punch test device. W ...

2005

The strain-hardening behaviour of a tempered martensitic iron-chromium-carbon model was examined in terms of dislocation mechanics. Tensile tests of this body-centered cubic alloy were carried out from 77 up to 293 K. A specific relationship between the fl ...

Elsevier2005

Effects of neutron irradiation on the microstructure and mechanical properties of the heat affected zone of stainless steel welds

The effects of neutron irradiation on austenitic stainless steels, usually used for the manufacturing of internal elements of nuclear reactors (e.g. the core shrouds), are the alteration of the microchemistry and the microstructure, and, as a consequence, ...

EPFL2005

Plastic flow of martensitic model alloys

Philippe Spätig, Robin Schäublin, Raul Alejandro Bonadé

Modeling of the constitutive behavior was undertaken for Fe- Cr-C tempered martensitic alloys. Tensile tests were carried out at room temperature and constant nominal strain rate. In order to obtain a fully martensitic structure with different prior austen ...

2004

Assessment of the constitutive properties from small ball punch test: experiment and modeling

Philippe Spätig, Raul Alejandro Bonadé, Emiliano Campitelli

An assessment of the true stress-true strain relationship has been done by means of tensile and small ball punch tests on austenitic and tempered martensitic steel at room temperature. A finite element model was developed and validated to calculate the for ...

2004

Mechanical properties and microstructure of a high carbon steel

Iva Tkalcec Vâju

This work is focussed on a high carbon tool steel used for the production of files. The mechanical properties of the files depend on a hardening thermal treatment that produces a martensitic structure. Thus, the motivation for this work is technological: w ...

EPFL2004

Mechanical dispersion of Y2O3 nanoparticles in steel EUROFER 97: process and optimisation

The procedures followed to produce Y2O3-dispersed EUROFER 97 powder ready to be compacted and hot isostatic pressing processed are reported. An attrition mill has been used under controlled conditions. The compositional and microstructural characterization ...

2003

In an effort to better understand the plasticity of tempered martensitic steels, uniaxial tension and compression tests were carried out. The temperature dependence of both the yield stress and the post-yield stress behavior were compared, and it was shown ...

2002